Update tag to 3.2-p4

Author: ninaangelvik

.github/workflows/deploy.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           repository: zalando/spilo
-          ref: 3.2-p3
+          ref: 3.2-p4
 
       - name: Become one with the container registry
         uses: docker/login-action@v1